*: According to Taleb traditional statistical models do not take enough into account the likely occurrence of rare events which have rarely been observed in the recent past, such as a market crash, the diagnosis of a rare sickness, or the existence of a black swan. More related to the field of stocks, bonds and options, a "black swan" event can be the start of a terrible market crash. According to Taleb this flaw in the statistical models traditional taught in business schools has devastating consequences for those who follow them blindly, both in the field of economics and in real life.